Hoisting apparatus.



A. E. NORRIS.

HOISTING APPAEATIW). APPLICATION FILED JAN.18,1908. RENEWED NOV. 0,1012.

Patented July 22, 1913.

Invenliwr illrmon E 21 51 1 as 0 A. E. NORRI$.

HOISTING APPARATUS. APPLICATION FILED JAN.18, 190s. REHEWBD NOV.D,1912.

Patented July 22, 1913.

5 SHEETS-SHEET 2.

A. E. NORRIS.

HOISTING APPARATUS. APPLIGATION FILED JAN, 18, 1908. RENEWED NOV. 9,1012.-

Patented July 22, 1913.

5 SHEETS-SHEBT 3.

Invcnifor b QZzno-n EMrrzis P (flags wiine sses:

A. E. NORRIS.

HOISTING APPARATUS.

APPLIOATION FILED JAN.18, 190a. RENEWED NOV.9,1912.

Patented July 22, 1913.

5 SHBETS-SHEET 4.

121116111301 lllrnon E MIZZZLS.

Zlliinenss es A. E. NORRIS.

HOISTING APPARATUS.

A'PPLIOATION IILBD JAN-.18, 1908. RENEWED NOV. 9, 1912.

F5 2'9 as IL H+- i i 94 SE ,1":

a3 wzinessess al In vEo;g ar

ini? citizen of the United ALB/ION 1E. NORRIS, 01F CAMBRIDGE,MASSACHUSETTS.

llttllLS'llJtNil. APPARATUS.

lhtltiddlld.

Application filed January 18, race, Serial Ito. lLd' G.

specification of Letters Patent.

Patented July 22, M913. henewed November 9, 1912. Serial No. 730,500.

To all whom ii may concern Be it known that 1, Aurora 'lil. Norms, aStates, residing at Cambridge, in the county of Middlesex and State oflllassachusetts, have invented an Improvement in Hoisting Apparatus, otwhich the following description, in connection with the accompanyingdrawings, is a specification, like letters on the drawings representinglike parts.

My invention relates to hoisting apparatus and consists moreparticularly in improve ments which add to the eii iciencyand'economical operation, as well as facilitating the control of suchapparatus.

My invention will be best understood by reference" to the followingdescription when taken in connection with the accompanying illustrationof one specific embodiment thereof, while its scope will be moreparticularly pointed out in the appended claims.

lln the drawings :Figure 1 shows in side elevation a hoisting towerembodying one form of my invention; Fig. 2 shows an elevation partiallyin section of the trolley rope-winding drum; Fig. 3 is a detail showingthe triction band and associated parts controlling the trolley drum;Fig. 4c is a sectional plan and. on an enlarged scaleshow ing theprincipal controlling and motive parts :For controlling the movements ofthe trolley'and bucket; Fig. 5 is a side elevation of the parts shown inFig. l; Fig. 6 shows inperspective and on an enlarged scale theconstruction and connections of the controlling levers; Fig. 7 is' alongitudinal sectional elevation taken through theibase of the lefthandcontrolling lever; Fig, 8 is a longitudinal sectionalclevation of thevalve which governs the pressure-actuated controller for the trolleydrum; Fig. 9 is asectional elevation showing a form of the throttlevalve adapted for use in conjunction with the disclosed form of hoistingapparatus; Fig. 10 is a sectional elevation showing the pressurecontroller for the trolley drum; and Fig. 11 is a section on theline-11--11 in Fig. 9 showing the construction of the sliding throttlevalve.

Referring to the drawings, it have there shown my invention as appliedto a hoisting tower 1, carrying the laterally extending boom 2, whichlatter provides a trackway for the,trolley carriage 3, by which thehoisting element, herein represented as the grab or bucket 4-, iscarried. 'While l have shown my invention as embodied in an apparatus ofthis type, that is, a tower, hoist, and employing the instrumentalitieswhich are herein specifically described, and while this willsufliciently set forth the broad principles of the invention for theunderstanding of those skilled in the art, it is to be understood thatthe application of this invention is not limited to this particular typeof hoisting apparatus, or to a hoisting apparatus employing the elementswhich are here alone set forth, but that numerous otherapplications andembodiments of the herein described invention may be had.

Referring to the specific details of the illustrated apparatus, thebucket l, which may be'of any suitable or usual construction, such forexample, as that set forth in ll. S.

Patent No. 699,000, dated April 29, 1902, is provided with operatingropesby which the raising and lowering of the bucket and the opening andclosing of the bucket jaws may be controlled. In the present instancethe operating ropes are two in number, and comprise the hoisting rope 5,by which the bucket is suspended and raised or lowered, and the openingandclosing' rope 6, by which the jaws are opened or closed. "itheseropes both pass upward over and about suitable sheaves 7 upon thetrolley, thence obliquely upward over the guide sheaves 8 near the topof the tower 1, and thence downward to the operating room near the baseof the tower, Where they pass over and about and are, secured tosuitable rope-winding drums 9 and 10 (Fig. l), the former, or thehoisting drum, serving to control the hoisting rope 5, and the latter,or the opening and closing drum, serving to control the opening andclosing rope (i. The trolley with its attached bucket is traversedoutwardly along the boom by means of the trolley rope 11 fixed to theouter end of the trolley carriage, whence it passes to the end of theboom over the guide sheave 12, thence back to the tower over and aboutthe guide sheave 18, and thence to the trolley drum 14 (Fig. 4) uponwhich it is wound or unwound at the will of the operator. When thebucket is hoisted the inward pull of the oblique hoistin rope 5 tends totraverse the trolley inward y along the boom toward the tower, so thatthe trolley may be traversed at will in either direction by merelywinding in the trolley rope on the trolley drum, or releasing thetrolley'drum to permit the rope to unwind One important feature of myinvent-ion is the arrangement of controlling devices in such simple andefiicient manner that the entire control of the bucket through the threerope-winding drums described, may be handled by a single operatorstationed upon the platform 15 in the operating room.

Any suitable devices for driving the ropewinding drums may be employed,but referring to the details of the driving connections for the drums,which are here shown for the purpose of illustrating my invention, thehoisting drum 9 and opening and closing drum 10 are loosely journaledside by side upon the main driving shaft 16, but may be clutchedthereto, either separately or together by being forced into engagementwith the centrally located clutch member 17 (see broken away portion,Fig. i). The drum shaft is connected at opposite ends through a crankand connecting-rod connection, to a two-cylinder horizontal engine, forwhich, however, may be substituted any suitable motor,

21'. Theclutch-operating. screws for the 31 with the hand lever 29.

- drum 9 are connected to the rod 22, which latter is connected to bemoved as the sleeve 23 is turned, which sleeve is journaled forindependent movement upon the shaft 21. The clutch-operating sleeve 23carries the arm 24: attached to the link connection 25, the latterextending to the operating platform 15, where it is attached to the handlever 26. The clutch-operating shaft similarly has connection throughthe upright arm 27 and a connecting link 28 with the hand-lever 29 alsoat the operating platform. The hand levers 26 and 29 are pivotallymounted side by side (see Fig. 6) so that through their manipulation theoperator can readily control the clutching or unclutching of therope-winding drums. By

- the side of the hand lever 29 is a substantially horizontal foot lever30 (see also Fig. 6) fulcrumed upon the supporting bracket The footlever which is arranged to be conveniently operated by the toweroperator is connected to a flexible member, such as the rope 32, which,passing up and over suitable sheaves, leads across the tower and thencedown to the arm 33 of the throttle valve for the 5 main hoisting engine.To the throttle valve arm is also connected the spring 34 tendingnormally to close said throttle. The latter, however, may be readilyopened to a greater or less extent through thethrottle rope 32 caused bydownward pressure upon the foot treadle 30. It will therefore be seenthat the operator can entirely control the movements of the hoisting andopening and closing ropes from the two hand levers 26 and 29, and,through the foot lever 30, can also control the starting and stopping ofthe engine which drives the hoisting and opening and closing drums 9 and10. In the present embodiment of my invention 1 have also associatedwith the operating platform other controlling devices by whichthe'movements of the trolley can be regulated so that the entire controlof all the movements of the bucket may be exercised by a single operatorwithout altering his position upon the operating platform.

Although other means for winding in or letting out the trolley rope 11may be employed, I have here provided for that purpose an additional butsmaller double-cylinder horizontal trolley engine connected by means ofa crank and connecting rod to drive the trolley drum 14. The latter isloosely journaled upon its drivin shaft 35 but'is adapted to be driventherefrom-when desired through the medium of interposed planetarygearing. The latter (Fig. 2) comprises the secured to the mediate pinionor pinions 37 carried by and journaled upon a part-of the drum, and theinternal gear 38, the latter secured to or comprising a part of therotatable member 39 which is mounted for free rotation about the shaft35 excepting when held or opposed by the friction hand brake 40. Thelatter (Fig. 3) encircles a suitably formed drum face on the rotatablemember and is connected to the operating lever 41, depression of whichacts to apply the band, and elevation to release the same. lVhen,therefore, it is desired to drive the drum 14 and wind in the trolleyrope the band is tightened to hold the rotatable member 39 fast, thiscausing the drum to turn in the same direction as its driving shaft butat a slower rate of speed. When necessary to release the drum forunwinding the band may be loosened leaving the rotatable member and thedrum free to turn. The band is normally keptapplied to hold therotatable member against movement by suitable means such as the spring42 actin against the lever 41, but may be released y lifting movement ofthe rope 43 attached to one end of the lever.

The reverse or rope-unwinding movementof the trolley drum driving shaft,and therefore, of the drum itself when connected to the shaft, ispreferably prevented by the upward pull of driving pinion 36 keyed ordriving shaft 35, the inter- I some such means as the automatic brakes44:

ill)

ineaovo which are shown encircling the crank disks at the opposite endsof the trolley drum shaft. These permit turning movement of the drivingshaftin a forward direction only. Any suitable brake construction may beemployed for this purpose such, for example, as that shown in my priorPatent Reissue No. 12,040. The rope 43 controlling the trolley drumpasses upwardly over the sheaves as and t6 and thence down to suitablecontrolling devices (to be described) at the operating platform. Thestarting and stopping of the trolley engine may also be controlled fromthe operating platform by means of a third controlling rope l7, which,passing over approximate sheaves, is connected. (see Figs. l and.5) tothe throttle valve 48 of the trolley engine. Automatic brakes 49 arepreferably provided upon the hoisting drum shaft for preventing thelatter from turning, except in the direction when winding on, thesebeing similar to the brakes provided at opposite ends of the trolleydrum shaft.

Referring now more particularly to the controlling devices at theoperating platform, the trolley engine throttle rope 47 is connected(Figs. 6 and 7) toone arm of a bell-crank lever 50, pivoted upon thebracket 51, the other arm of said lever being forked to embracethe sliderod 52 between fixed collars 53 and 54. Reversely arranged withreference to said rod is a second bell-crank lever 55 connected to alink 56, the latter jointed to a sliding block 67 upon the handlever 26,the hand latch 58 being provided to lie closely adjacent to the handleof the lever 26 and have connection to the sliding block through thelinks 59, whereby the operator, without ren'ioving his hand from thelever 26, may also open and close or partially close the throttle forthe trolley engine by pressing or releasing the hand latch 58. lVhen thehand latch 58 is pressed the bellcrank level- 55 is moved to slide therod 52 .inwardly and draw down the rope 47, thereby opening or partiallyopening the throttle. The slide rod 52 being arranged substantially inline with the axis about which the hand-lever 26 is moved, movement ofthe latter does not tend to draw down the trolley rope or otherwiseaffect the same.

in order to control the trolley drum and, therefore, the movements ofthe trolley, it have provided a hand latch 60 pivoted adjacent thehandle of the hand-lever 29, but, in order that thecontrol of such handlatch over the trolley drum may be exercised with nicety andeffectiveness, l have interposed between such latch and the frictionband 40 a pressure-actuated controller, by which power is directlyapplied to the control of the said friction band.

Referring to Figs. 6, 8 and 10, the trolley drum controlling rope i3 isconnected at the operating platform to a piston-rod 61, the latterhaving attached thereto (Fig. 10) the piston 62 working within thepressure cylinder 63. lt therefore follows that when the piston is drawndown it draws down the operating rope 43, lifting the brake-operatinglever 41 and releasing the band 40 to permit the free unwinding movementof the trolley drum. The lower part of the cylinder 63 is connected tothe atmosphere through the vent pipe 64, but the upper part hasconnection to thepipe 65 'which may be placed in communication with asource of steam or other pressure or with the atmosphere at will, bymeans of the hand latch 60 on the hand-lever 29. The piston is normallyheld at the top-of the cylinder by the effect of the spring 42 at thetrolley drum, but whcn'the hand latch 60 is moved to admit pressurethrough the pipe 65 the piston is forced down and the brake released. Tocontrol the supply of pressure through the pipe 65 the hand latch hasjointed donnection through the link 66 with a sliding block 67, thelatter attached through the link (38 to the pivoted bell-crank lever 69.The depending end of the latter (Figs. 6 and 7) is forked and embracesthe headed end of the valve stem 70 arranged in line with the axis aboutwhich the hand lever 29 turns. The valve stem passes through suitablypacked openings through the valve chamber 71, within which it isattached to a D-slide valve 72, adapted to slide along the valve seat(58. At the opposite side of the valve chamber the valve stem isencircled by a spiral spring 74 adapted to press againsta washer and nutupon the stem, so that the latter is normally held in the position shownwith the nuts 75 abuttingagainstthe stop piece 76. Steam or otherpressureis admitted to the valve chamber through the ad mission pipe 77.The port 78 is connected to the cylinder through the pipe (35 and theport 79 is connected to the exhaust pipe 80 (see Fig. 6). In theposition shown, and so long as the hand latch (30 is not gripped by thehand of the operator, the valve 72 maintains communication between theports 78 and 79, and therefore between the cylinder 63 and the exhaust.When the hand latch is pressed by the hand of the operator the valve 72is moved to the left, and viewed in Fig. 8, against the pressure of thespring 74-, opening the port 78, and, therefore, the cylinder 63 to thelive pressure in the valve chamber. This immediately releases the brakeat the trolley drum and renders the latter effective for letting out therope, the speed of the traverse of the trolley being within the controlof the 'attendant through variations of the hand latch 60.

From the description of the operating le vers itwill be seen that theoperator has pressure upon the within the control of his right hand theclutching and unclutching of the grab opening and closing rope, and, atthe same time, through the hand latch (30, the control of the inwardmovement of the trolley. Subject to the control of his left-hand is theclutching and unclutching of the hoisting rope drum and the throttlecontrol of the trolley engine, the throttle control of the hoistingengine being within his supervision through the medium of the foot lever30. This places within the control of a single operator these functionswhich customarily require the presence of two different attendants.

During the operation of thetower the trolley is normally held in theposition where it is left by the automatic brakes 44. Then the operatordesires to run the trolley out it is necessary merely to press thelefthand latch 58, thereby starting the trolley enginewhich winds in thetrolley rope, the winding in movement of the drum being unhindered bythe automatic brakes l l. lVhen it is desired to run the trolley in itis necessary only to press the right-hand latch 60, thereby releasingthe friction band 40 more or less according to the speed of trolleymovement desired.

\Vhere a pressure fluid engine is employed for the purpose of traversingthe trolley in an apparatus of the class described, it is desirable toprovide some means for stopping the traverse of the carriage at theprecise point desired. If an ordinary throttle valve is employed, whenthe steam is' shut off from the trolley engine cylinders by releasingthe throttle controlling latch 58, the pressure trapped and remaining-inthe cylinder is apt to cause a creeping or continuation of thetraversing movement of the trolley due to the expansion of the trappedpressure within the cylinder and the conse' quent turning of the trolleydrum. In this connection, therefore, I preferably employ a form ofthrottle valve, which, when closed by the release of the controllinglatch 58 not only shuts off the pressure from the cylinder, but opensthe latter to the exhaust sufiiciently to clear the cylinders of thetrapped steam. Referring to Fig. 9 I have there shown one form ofa'throttle release valve which is well suited for this purpose, andwhich in Figs. 4 and 5 is shown as applied to the trolley engine. Thisvalve has connection to the steam admission pipe'81 which conducts thesteam to the annular chamber 82 where its admission to the cyl inderpipe 83 is controlled by the sliding throttle valve 84. The latter hasits edge notched as at 85 so as to give a gradual initial admission. ofa hollow cylinder open from end to end but having its upper endpro-vided with the arched piece 86, to which is secured the valve rod 87passing The valve is in the form through the stuffingbox 88. On theoutside the rod is provided with the adjustable collar 89 and thecompression spring 90, the latter abutting against the yoke 91 andacting against the collar to normally close the valve as shown 1,

in Fig. 9. The nut 92 upon the valve stem limits its closing movement bycontact with the yoke 91.- At the opposite side of the steam pipe 81 thevalve chamber is provided with a connection 93 leading to the exhaust,the said connection entering the chamber by" an opening 9 1 which ispartly uncovered by the upper edge of the valve when the latter 1s inits closed position, as shown. It therefore provides that the steam, ifany be trapped in the cylinder on' the closing of the valve, may passupwardly through the hollow valve to the space above the valveand thenceoutward through the opening 94 and connection 93, as indicated by thearrows in Fig. By this means the steamleft in the cylinder when thevalve is closed is released and any tendency to move the trolleycarriage precluded after the releaselof the throttle controlling latch58.

\Vhile I have employed the term rope in designating the various powertransmission members, it will be understood that the same is intended toapply to and include cables, chains or other like transmission deviceswhere the latter are capable of performing equivalent functions.

\Yhile I have shown and described one form of my invention, it is to beunderstood that the same is not limited to the details of parts-hereinshown, or to the specific application of the invention described, butthat extensive modifications may be made therein Without departing fromthe spirit of the invention.

Claims:

1. A hoisting apparatus having a trolley carriage. a trolley traversingdrum, a driving motor, a driving shaft, planetary earing between the tieley drum and the driving shaft lncluding a rotatable member, means forrestraining the latter from rotation, and means for preventing therotation of said driving shaft except in one direction.

v2'. A hoisting apparatus having a trolley carriage, a traversing ropetherefor, a ropewi-nding drum for Said rope, a driving shaft for saiddrum, a driving motor, planetary gearing between said driving shaft andsaid drum, the same including a rotatable member, means for holding saidmember against rotation to cause said motor to turn said drum and windin said traversing rope, means to prevent the driving shaft from turningexcept in a rope-winding direction and means to release said rotatablemember tion with a trolley, a hoisting bucket carried thereby,controlling ropes associated with said bucket, controlling leverstherefor, a trolley traversing rope, a rope-windm drum a drivin shaftlanetar Yeara a P .l t

ing between said shaft and said drum adapted when efiectiveto cause thero tie-winding movement of said drum, controlling means associated-withsaid bucket and controlling W levers for rendering said planetarygearing etl'ective. or ineffective at will.

4-,. In a grab hoist the combination with a trolley, a trolley drum andtrolley drum driving motor, of a plurality of controlling a levers forcontrolling the movement of the grab, planetary gearing between thetrolley drum and the driving motor, a braking device for controllingsaid planetary gearing and means on one of the said levers for con- 2trolling said braking device.

" 5. In a hoisting apparatus the combination with a traversing carriage,of a traversing drum therefor, driving means, planetary gearing throughwhich said drum is adapted to be connected to said driving means and apressure-controlled device for controlling the connection thereofthrough said planetary gearing.

6. In a hoisting apparatus the combination with a traversing carriage,of a traversing drum therefor, driving means, planetary gearing throughwhich said drum is adapted to be connected to said driving means and ahand latch for controlling the connection thereof through said planetarygearing.

' 7. The combination with a trolley, a hoisting device, a trolleytraversing drum, of driving means therefor, planetary gearing betweensaid driving means and said drum adapted to throw the latterinto orout-of operative connection with the driving means, a controlling leverfor said hoisting device and auxiliary controlling means upon said leverfor controlling said planetary gearing.

8. In a hoisting apparatus the combination with a trolley, ahoistingdevice carried thereby, a trolley traversing drum, a pres sure fluidengine for operating said drum and a pressure r lief throttle for saidengine. 9. A hoisting apparatus comprising a trolley, a grab carriethereby, a controlling ';lever for said grab, a trolley traversing drum,a pressure fluid engine for operating said drum, a pressure-reliefthrottle valve for said engine and auxiliary means to con 11. A hoist ngapparatus having a trolley rarriage. a trolley traversing drum,a'drivlug shaft for said drum, planetary gearing between the drum andthe driving shaft, including a rotatable member, means for restrainingthe latter from rotation, a handoperated controlling lever, and anauxiliary controlling device mounted upon saidlcontrolling lever andconnected to operate said restraining means. V

12. In a hoisting apparatus, the combina-"- tion with a bucket, of apair of bucket levers. a traversing rope, a winding drum and pressurefluid engine for turning the drum, a combined throttle and relief valvefor con-i trolling the engine, and means operated from the bucketoperators position at the bucket levers for controlling'said valve.

13. In a hoisting apparatus, the combination with a bucket of a )air ofbucketlevers, a traversing rope, winding drum and pressure fluid enginefor turning the drum, a combined throttle and relief valve forcontrolling the engine and a grasping-device on a bucket lever forcontrolling said valve."

14. In a hoisting apparatus, the combination with a bucket of a pair ofbucket operating levers, a traversing rope, a traversing drum, and apressure-fluid engine connected to turn the drum, throttle means andrelief means for the engine and manually controlled means at the bucket(Yperators posi tion to control said reliefi'ineans and aid 100 throttlemeans.

15. In a hoisting apparatus, the combination with a bucket of a pair ofbucket operating levers, a traversin rope, a traversing drum and apressure-flu (1 engine connected to turn the drum, throttle means andrelief meansfor the engine and means connected to one of thebucket-operat-in levers for controlling said relief means ant said thrott-le means.

16'. In a hoisting apparatus, the combination with a bucket of a pair ofbucket operating levers, a traversing rope, a traversing drum and apressure-fluldengine connected means for the engine, a grasping deviceon one of the bucket levers for controlling said relief means and'saidthrottle means.

17. In a hoisting apparatus the combination with a bucket of a atravel-sin rope, a rope winding drum andapressureuid engine connected toturn the drum, throttle means, engine relief means, meanscont-rolling'said throttle means and said relief means at the bucketoperators 125 position including a throttle control element connected toone of the bucket levers.

18. The combination with a bucket of a pair of bucket operating levers,a traversing to turn'the drum, throttle means and relief pair of bucketlevers, 12o

rope, a rope winding drum, a pressure fluid engine to turn the drum,throttle means, relief means and a movable grasping device on one of thelevers for controlling both the throttle means and the relief means.

19. The combination with a bucket of a pair of bucket operating levers,a traversing grasping device on one rope, a rope Winding drum, apressure fluid engine to turn the drum, engine relief means and agrasping device pivoted on one of said bucket operating levers andadapted to close said relief means when grasped.

. 20. The combination with a bucket of a pair of bucket operatinglevers, a traversing rope, a rope winding drum, a pressure fluid engineto turn means, a brake and means for controlling said relief means andsaid brake at the bucket operators position including a control elementfor opening and closing said relief means and a separate control elementfor controlling the brake.

21. The combination with a bucket of a pair of bucketoperating levers atraversing rope, a rope Winding drum, a pressure fluid engine to turnthe drum, engine relief means, a brake and means for controlling saidrelief means and said brake at the bucket operators position including abucket lever for controlling said relief means and a separate. controlelement for controlling the brake.

22. The combination with a bucket of a pair of bucket'operating levers,a traversing rope, a rope winding drum, a pressure fluid engine to turnthe drum, engine relief means, a brake and means for controlling said'relief means and said brake at the bucket operators position includingmanually actuated devices on one of said bucket levers for controllingthe brake, and a separate controlling element for opening and closingsaid relief means.

23. The combination with a bucket of a pair of bucket operating levers,a traversing rope, a rope winding drum, a pressure fluid engine toiturnthe drum, engine relief means, a brake and means for controlling saidrelief means and said brake at the bucket operators position including amovable auxiliary control element on each bucket lever, one forcontrolling the brake the drum, engine relief and the other forcontrolling said relief means. p e

' 24. The combination with a bucket of a pair of bucket levers, atraversed'support, a traversing rope, a rope Winding drum, a pressurefluid engine to turn the same, engine relief means, throttle means,abrake for said drum and two controlling elements at the bucketo-perators position for controlling said relief means, throttle andbrake, a movement of one of said elements serving to release the brakewith the relief means open to move the traversed support in onedirection and movement of the other serving to openthe throttle meanswith the brake released, and relief means closed to cause movement ofsaid support in the opposite direction.

25. In a hoisting apparatus, the combination with a trolley, a bucket, atrolley rope for hauling the trolley in one direction, a rope windingdrum, a driving engine for said drum, a brake for automaticallypreventing the unwinding movement of said drum while permitting theengine driven winding-on movement thereof, means for releasing thebrakes to permit the unwinding movement and simultaneously relieving thepressure in the engine cylinder.

26. In a hoisting apparatus, the combination with a hoisting device suchas a grab or the like, controlling means therefor, a trolley, a trolleyrope, a rope-winding drum therefor, a brake normally preventin theunwinding movement of the drum, w hile permitting winding-in movementthereof, a driving engine for the drum, throttle means and relief meansfor the engine, and means to control said relief means and said throttlemeans.

27. In a hoisting apparatus, the combination with a bucket 4, a trolley3 and trolley engine, of throttle means and relief means 84, 85, 93.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesses.

ALMON E. NORRIS;

